Device for removing and installing camshaft bushings



April 27, 1943. P. G. RUTTEN 2,317,405

DEVICE FOR REMOVI'NG AND INSTALLING cAMsH F'T BUSHINGS Filed May 6, 19412 Sheets-Sheet 1 April 27, 1943. P, RUTTEN DEVICE FOR REMOVING ANDINSTALLING CAMSHAFT BUSHINGS 2 Sheets-Sheet 2 Filed May 6, 1941 PatentedApr. 27, 1943 DEVECE- FOR REMOVING AND INSTALLING GAMSHAFT BUSHINGS PaulG. Rutten, United States Army Application May 6, 1941, Serial No.392,087

(Granted under the act of March 3, 1883, as

amended April 30, 1928; 370 O. G. 757) 2 Claims.

The invention described herein, if patented, may be manufactured andused by or for the Government for governmental purposes without thepayment of any royalty thereon.

This invention relates to a simple and yet efficient device for use inremoving and installing camshaft bushings in internal combustion enginesor any other type of engine that requires the use of a camshaft.

An important object of the invention is to provide a device which isuniversal and adapted to be used on any engine in the automotiveindustry.

Another object of the invention is to provide a device which is adaptedto engage and remove a bushing which cannot, by reason of itsinaccessibility, be readily removed by any other method.

Another object of the invention is to provide a device which willeliminate the old method of removing camshaft bushings by tools in thehands of an operator.

Another object of the invention is to provide a repair device formanipulating bushings and the like by a longitudinal movement in eitherdirection while rotary movement thereof is readily prevented.

Another object of the invention is to provide a device by the use ofwhich at least two womout or defective bushings can be quickly andeasily removed, and new bushings inserted simultaneously without causingdistortion of the new bushings, and at the same time remain in alignmentover its entire length during the operation.

Another object of the invention is to provide a device which preventsmis-alignment or buckling of the new bushings during the insertionthereof.

A further object of the invention is to provide a device which is simplein construction and arrangement, readily operated, durable in service,and a general improvement in the art.

Heretofore, it has been found necessary in the automotive industry toremove old bushings with a hammer and chisel and to drive in newbushings with a hammer and block. This old method caused distortion ofthe new bushings and as a result thereof low spots in the bushing afterline boring thereof. This device was primarily designed to eliminate theold method and, at the same time, produce a tool that would remove andreplace the bushings in internal combustion engines, where the oldmethod could not be used due to the inaccessibility of the bushings byreason of the construction of the particular internal combustion engineinvolved.

The accomplishment of the above and other related objects are embodiedin the forms illustrated in the accompanying drawings, wherein theinvention is shown consisting of features of construction, arrangementand application of parts, which will appear in the specification and befinally pointed out in the claims.

While the preferred embodiment of the invention is shown, it will beunderstood that slight changes in form and minor details of constructionmay be resorted to without departing from the spirit of the inventionand fall beyond the scope of the claims.

Referring now to the drawings, in which similar characters andreferences in the several figures indicate identical parts:

Fig, 1 is a sectional view through the crank case of a motor,illustrating the employment of the device during the extraction andreplacing of the bushing in the bearing of a camshaft.

Fig. 2 is a perspective view of the device showing the various parts ofthe tool.

Fig. 3 is a view partly in side elevation and partly in longitudinalsection of the embodiment of the invention in assembled condition.

Fig. 4 is a vertical sectional view of the device, on a line 4-4 of Fig.1.

Fig. 5 is the same on line 5-5 of Fig. 1.

Reference now being made to the drawings by numeral, I9 indicates thecrank case of an explosive motor in which a plurality of bearings I I,I2, l3 and M are provided in axial alignment with each other forjournaling the camshaft of the motor, it being understood that abushing, such as at I5, is provided in the bore l6 of each journal withthe shaft, not shown, which is mounted for turning in the bushings, asshown.

The device comprises a rod H, which is of less diameter than the bearingbore l6, having a threaded portion or shank l8 at one end thereof, uponwhich a nut I9 is threaded.

Loosely fitting on the rod I1 is an abutment or thrust block 28, havinga reduced neck or nipple 2| of a size adapted to enter and support theend of the thrust sleeve or end spacer 22. The diameter of the sleeve issuch that it is not capable of passing into and through the bore l6 ofthe journals but is adapted to rest against the side 23 of the motor l0.

The rod I! is adapted to receive loosely thereon a mandrel 24, having onone end a cylindrical extension 25 of less diameter than the diameter ofthe mandrel 24.

The rod I! is provided with reduced portions 26, which are adapted toreceive a horseshoe ring, or washer 21, which is adapted to be insertedto the rear of and abut with the mandrel 24 when the device is inoperation.

There is provided a lock or retainer, comprising a spring pressed ball28, which is adapted to prevent the ring or washer 21 from dropping offof the rod 11. Suitably positioned in the rod [1 are openings 29 whichare adapted to receive a pin 30 which contacts with the motor, therebyacting as a stop to prevent rotative movement of the rod when the deviceis in operation.

From the foregoing, it is apparent that the invention is designed andadapted for extracting or inserting a plurality of bushings of varioussizes, depending only upon the length and di ameter of the cylindricalextension 25 of the mandrel 24. Therefore, the same elements can beemployed to extract or install bushings of different longitudinal sizesand diameters.

The mandrel 24, which is adapted to engage the ends of the bushings, isprovided with an extended, reduced portion, designed and adapted toextend into the bushings, and thus locate the rod co-axially with thebushings, thereby avoiding lateral stress and strains While at the sametime preventing the distortion of the bushings.

Pressure is applied to the ends of the bushings in a direction parallelwith the axis thereof, so that no twisting or strains occur, and furtherrotation of the rods is prevented by inserting pins therein which tendsto rest against the motor l and acts as stops therefor.

In operating the device, the rod is placed through the camshaft journalsand a mandrel is slipped on the rod, being placed on in such a mannerthat the new bushing will abut the old bushing.

Horseshoe rings or washers are placed in the rear of each mandrel to actas stops therefor. The thrust sleeve is placed so that the forward endthereof will abut against the motor Ill. The reduced end of the thrustblockreceives the thrust sleeve, thereby aligning th thrust sleeve inrelation to the rod. Pressure is then applied to the ends of the oldbushings in a direction parallel with the axis thereof by rotating thenut IS in a clockwise manner. As the pressure is increased, the oldbushing will be extracted and a new one inserted.

The invention therefore exemplifies a bushing removing and replacingdevice; which enables expeditious operation in the replacing or removingof bushings without distortion or destrucnon of: the bushing, which waspresent in the old method of operation.

It will be understood, therefore, by those skilled in the art, that theembodiment of the invention herein disclosed accomplishes the principalob- .iect of theinvention. It also has uses and ad'- vantages other thanthose herein particularly referred to. Also, that v rious changes andmodifications maybe made without departing from the irit of theinvention and'since the embodiment disclosed herein, being onlyillustrative of the device, the invention is not to be understood asrestricted thereto, since this may be r l within the scope of theappended clairnswithout' departing from the spirit and scope of theinvention.

Having thus described the invention; what is claimed as new and desiredto secure by Letters Patent is:

1. A device for extracting old camshaft bushings and inserting newcamshaft bushings in place of the old ones in a motor block, comprisinga common guide means extending the entire length of the motor block,having one end portion threaded, an. adjusting nut on the threadedportion thereof, a plurality of reduced portions on said common guidemeans, said reduced portions being uniformly reduced and regularlyspaced apart from each other so that one of said reduced portions willlie adjacent any bearing surface surrounding said guide means, each ofsaid reduced portions being adapted to receive a horseshoe ring,together with a plurality of transverse openings through the guidemeans, said transverse openings being spaced apart from each other andpositioned between said reduced portions and adapted to receive a crosspin, a thrust block shiftable upon the shaft in contact with said nut,said thrust block having an enlarged portion and a reduced portion, athrust sleeve contacting said shiftable thrust block adapted to contactthe base of said motor block, bushing holding member adapted to be movedlongitudinally on said common guide means to any selected positionrelative to said reduced portions, said guide means adapted to keep saidbushing holding member in alignment during operation, said bushingholding member provided with an enlarged portion for engaging one end ofa bushing, an elongated portion of sufiicient length and diameter forfully accommodating and internally engaging and guiding a bushing whichis engaging and extending from said enlarged portion, said horseshoering adapted to prevent the moving of said movable bushing memberrelative to said guide means and said cross pin adapted to preventrotation of said guide means during the operation of the device.

A device ior exti-acti inserting new cainshait thereoi in a, motorblock, con

the old bushings are in thra. ty of reduced portions on reduced portionsbeing uniformiv 1' spaced apart one oi soace surround .lg said reducedportions being a to receive a horseshoe ring or washer t with apinrality of transverse openings tliro the shaft, transverse openingsbeing spaced from each other and positioned between said reducedportions and adapted to receive a cross pin, a

movable bushing-holding member adapted to be moved longitudinally onshaft, said shaft thereby adapted to keep said bushing-holding member inalignment during operation, said bushing-holding member provided with anenlarged portion for engaging one end of a bushing and an elongatedportion of ufhcient length and diameter for fully accommodating andinternally engaging guiding a bushing, horseshoe ring or washer adaptedto prevent the moving or said movable bushing member relative to saidshaft duringthe extracting of the oldbushing or the'inserticn of the newbushing and said cross pin adapted to be inserted in said shaittoprevent rotation thereof during the operation of the device;

PAUL G; RUTTEN.

